To begin, set your multimeter to voltage; ensure the power is on and all wires are connected to the component being tested. The four important troubleshooting procedures that apply to reading voltage are as follows:
1. Place the meter probes are on a path. If there is a voltage reading, the path is open.
Place one meter probe on the left side of the CR contact and the other probe on the left side of the HP switch. If you obtain a voltage reading, this indicates that either the path is open or the contacts are open.
2. Place the meter probes on a path. If there is no-voltage reading, the path is closed.
Place one meter probe on the left side of the CR contact and the other probe on the left side of the HP switch. If you obtain no voltage reading, the path is closed.
3. Place the meter probes across a load. If a voltage reading is obtained, the load is recieving current. When the load is NOT operating, you should check for a grounded winding and for winding resistance.
Place one meter probe on the right side of the LLP switch and the other probe on the left side of IT. If you obtain a voltage reading, the compressor contactor is energized and the compressor should be running.
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